Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of an electronic device having a display screenor portion thereof with a transitional graphical user interface appliedto the display screen or portion thereof and showing a first image ofthe claimed design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof; and,

FIG. 4 is a fourth image thereof.

The evenly spaced broken lines in the drawings show the electronicdevice and the portions of the display screen or portion thereof withtransitional graphical user interface, and form no part of the claimeddesign. The dot-dash broken lines in the drawings show a display screenor portion thereof and form no part of the claimed design.

The appearance of the transitional image sequentially transitionsbetween the views shown in FIGS. 1-4 . The process or period in which animage transitions to another forms no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.